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Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
80
GRADE
B
FIX
2
REVIEW
0
PASS
4
INFO
0
Device:
Mobile Desktop
Checks
6
4 PASS 2 FIX
D
CO2 Per Page Load
Action
1.09g CO2 per view
FIX
1.09g CO2 per view
Warning::
1.09g CO2 per page view
This page transfers 4.6 MB, producing an estimated 1.09g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.23g, end-user device 0.84g.
Got: 1.09g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 130.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 130.6 kg of CO2 annually — equivalent to charging 16324 smartphones.
Info::
Green hosting reduces data center emissions

1.09g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 37% of websites

Sustainable Web Design model v4 · Page size: 4.6 MB

Your site
1.09g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.03g
Network
0.23g
End-user device
0.84g
At 10,000 monthly views: Monthly: 10.9 kg · Annual: 130.6 kg · ≈ 16324 smartphone charges
D
Carbon Budget
Action
63th percentile
FIX
63th percentile
Warning::
1.09g CO2 — above the median website (0.60g)
Heavier than an estimated 37% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 63th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.09g

63rd percentile

Cleaner than 37% of websites

✗ Above the median website

vs Median 81% more
vs Target 118% more
A+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Cloudflare, CDN: Cloudflare
Info::
Cloudflare: Verified by the Green Web Foundation
Info::
Cloudflare: 100% renewable energy for global network since 2019
Info::
Green hosting status based on known provider commitments
Green hosting detection uses a curated database of provider renewable energy commitments. This is not a real-time verification. For authoritative checks, visit thegreenwebfoundation.org.
Green Hosting✓ Green Hosted
Hosting Cloudflare✓CDN Cloudflare✓

Cloudflare: Verified by the Green Web Foundation

Cloudflare: 100% renewable energy for global network since 2019

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
88% cached
PASS
88% cached
Info::
88% reduction on repeat visits
Returning visitors download only 557 KB (vs 4708 KB first visit). 249 of 298 resources are served from browser cache, saving 0.96g CO2 per repeat visit.
Info::
Repeat visit: 0.13g CO2 (first visit: 1.09g)
First visit
4708 KB
Repeat visit
557 KB

88% reduction on repeat visits

Saving 0.96g CO2 per returning visitor

249 resources served from cache · 49 resources re-downloaded

A+
Transfer Efficiency
98% efficient
PASS
98% efficient
Info::
Transfer efficiency: 98%
Only 96 KB of potential savings identified. Your page is well-optimized for size.
98% efficient

Total waste: 96 KB (2% of page weight)

Unused JS 96 KB

0.02g unnecessary CO2 per visit

Actual transfer 4708 KB
Theoretical minimum 4612 KB
Potential savings 96 KB (0.02g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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